/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.streamsets.pipeline.lib.el;

import com.streamsets.pipeline.api.ElFunction;
import com.streamsets.pipeline.api.el.ELEval;
import com.streamsets.pipeline.api.el.ELVars;
import com.streamsets.pipeline.api.impl.Utils;

import java.util.Date;

public class TimeNowEL {

  public static final String TIME_CONTEXT_VAR = "time";
  public static final String TIME_NOW_CONTEXT_VAR = "time_now";

  @ElFunction(prefix = TIME_CONTEXT_VAR, name = "now", description = "")
  public static Date getTimeNowFunc() {
    Date now = (Date) ELEval.getVariablesInScope().getContextVariable(TIME_NOW_CONTEXT_VAR);
    Utils.checkArgument(now != null, "time:now() function has not been properly initialized");
    return now;
  }

  public static void setTimeNowInContext(ELVars variables, Date now) {
    Utils.checkNotNull(variables, "variables");
    variables.addContextVariable(TIME_NOW_CONTEXT_VAR, now);
  }
}
